var $ = jQuery,    // just in case. Make sure it's not an other libaray.

    $wrap = $('#uploader'),

    // 图片容器

    $queue = !$wrap.find('data-id') ? $('<ul class="filelist"></ul>').appendTo($wrap.find('.queueList')) : $('.filelist').appendTo($wrap.find('.filelist')),
    // $queue = $('<ul class="filelist"></ul>').appendTo($wrap.find('.queueList'));// : $('.filelist').appendTo($wrap.find('.filelist')),

    // 状态栏，包括进度和控制按钮
    $statusBar = $wrap.find('.statusBar'),

    // 文件总体选择信息。
    $info = $statusBar.find('.info'),

    // 上传按钮
    $upload = $wrap.find('.uploadBtn'),

    // 没选择文件之前的内容。
    $placeHolder = $wrap.find('.placeholder'),

    // 总体进度条
    $progress = $statusBar.find('.progress').hide(),

    // 添加的文件数量
    fileCount = 0,

    // 添加的文件总大小
    fileSize = 0,

    // 优化retina, 在retina下这个值是2
    ratio = window.devicePixelRatio || 1,

    // 缩略图大小
    thumbnailWidth = 110 * ratio,
    thumbnailHeight = 110 * ratio,

    // 可能有pedding, ready, uploading, confirm, done.
    state = 'pedding',

    // 所有文件的进度信息，key为file id
    percentages = {},

    supportTransition = (function () {
        var s = document.createElement('p').style,
            r = 'transition' in s ||
                'WebkitTransition' in s ||
                'MozTransition' in s ||
                'msTransition' in s ||
                'OTransition' in s;
        s = null;
        return r;
    })(),

    // WebUploader实例
    uploader;

if (!WebUploader.Uploader.support()) {
    toastr.warning('Web Uploader 不支持您的浏览器！如果你使用的是IE浏览器，请尝试升级 flash 播放器', '抱歉，初始化失败');
    throw new Error('WebUploader does not support the browser you are using.');
}

// 实例化
uploader = WebUploader.create({
    pick: {
        id: '#filePicker',
        label: '选择图片'
    },
    dnd: '#uploader .queueList',
    paste: document.body,
    accept: {
        title: 'Images',
        extensions: 'gif,jpg,jpeg,png',
        mimeTypes: 'image/gif,image/jpg,image/jpeg,image/png'
    },
    disableGlobalDnd: true,
    chunked: true,
    compress:false,
    server: 'https://upload-z2.qbox.me',
    fileNumLimit: 12 - $('.beforeImg').size(),
    fileSizeLimit: 50 * 1024 * 1024,
    fileSingleSizeLimit: 5 * 1024 * 1024,
    formData: {
        token: jQuery('#uploader').attr('data-token')
    }
});

// 添加“添加文件”的按钮，
uploader.addButton({
    id: '#filePicker2',
    label: '继续添加'
});


// 当有文件添加进来时执行，负责view的创建
function addFile(file) {
    var $li = $('<li id="' + file.id + '">' +
        '<p class="title">' + file.name + '</p>' +
        '<p class="imgWrap"></p>' +
        '<p class="progress"><span></span></p>' +
        '</li>'),

        $btns = $('<div class="file-panel">' +
            '<span class="cancel">删除</span>' +
            '<span class="rotateRight">向右旋转</span></div>').appendTo($li),
        $prgress = $li.find('p.progress span'),
        $wrap = $li.find('p.imgWrap'),
        $info = $('<p class="error"></p>'),

        showError = function (code) {
            switch (code) {
                case 'exceed_size':
                    text = '文件大小超出';
                    break;

                case 'interrupt':
                    text = '上传暂停';
                    break;

                default:
                    text = '上传失败，请重试';
                    break;
            }

            $info.text(text).appendTo($li);
        };

    if (file.getStatus() === 'invalid') {
        showError(file.statusText);
    } else {
        // @todo lazyload
        $wrap.text('预览中');
        uploader.makeThumb(file, function (error, src) {
            if (error) {
                $wrap.text('不能预览');
                return;
            }

            var img = $('<img src="' + src + '">');
            $wrap.empty().append(img);
        }, thumbnailWidth, thumbnailHeight);

        percentages[file.id] = [file.size, 0];
        file.rotation = 0;
    }

    file.on('statuschange', function (cur, prev) {
        if (prev === 'progress') {
            $prgress.hide().width(0);
        } else if (prev === 'queued') {
            $li.off('mouseenter mouseleave');
            $btns.remove();
        }

        // 成功
        if (cur === 'error' || cur === 'invalid') {
            showError(file.statusText);
            percentages[file.id][1] = 1;
        } else if (cur === 'interrupt') {
            showError('interrupt');
        } else if (cur === 'queued') {
            percentages[file.id][1] = 0;
        } else if (cur === 'progress') {
            $info.remove();
            $prgress.css('display', 'block');
        } else if (cur === 'complete') {
            $li.append('<span class="success"></span>');
        }

        $li.removeClass('state-' + prev).addClass('state-' + cur);
    });

    $wrap.on('mouseenter', function () {
        $btns.stop().animate({height: 30});
    });

    $wrap.on('mouseleave', function () {
        $btns.stop().animate({height: 0});
    });

    $btns.on('click', 'span', function () {
        var index = $(this).index(),
            deg;

        switch (index) {
            case 0:
                uploader.removeFile(file);
                return;
            case 1:
                file.rotation += 90;
                break;
            case 2:
                file.rotation -= 90;
                break;
        }

        if (supportTransition) {
            deg = 'rotate(' + file.rotation + 'deg)';
            $wrap.css({
                '-webkit-transform': deg,
                '-mos-transform': deg,
                '-o-transform': deg,
                'transform': deg
            });
        } else {
            $wrap.css('filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation=' + (~~((file.rotation / 90) % 4 + 4) % 4) + ')');
        }
    });

    $li.appendTo($queue);
}

// 负责view的销毁
function removeFile(file) {
    var $li = $('#' + file.id);

    delete percentages[file.id];
    updateTotalProgress();
    $li.off().find('.file-panel').off().end().remove();
}

function updateTotalProgress() {
    var loaded = 0,
        total = 0,
        spans = $progress.children(),
        percent;

    $.each(percentages, function (k, v) {
        total += v[0];
        loaded += v[0] * v[1];
    });

    percent = total ? loaded / total : 0;

    spans.eq(0).text(Math.round(percent * 100) + '%');
    spans.eq(1).css('width', Math.round(percent * 100) + '%');
    updateStatus();
}

function updateStatus() {
    var text = '', stats;

    if (state === 'ready') {
        text = '选中' + fileCount + '张图片，共' +
            WebUploader.formatSize(fileSize) + '。';
    } else if (state === 'confirm') {
        stats = uploader.getStats();
        if (stats.uploadFailNum) {
            text = '已成功上传' + stats.successNum + '张照片，' +
                stats.uploadFailNum + '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片'
        }

    } else {
        stats = uploader.getStats();
        text = '共' + fileCount + '张（' +
            WebUploader.formatSize(fileSize) +
            '），已上传' + stats.successNum + '张';

        if (stats.uploadFailNum) {
            text += '，失败' + stats.uploadFailNum + '张';
        }
    }

    $info.html(text);
}

function setState(val) {
    var file, stats;

    if (val === state) {
        return;
    }

    $upload.removeClass('state-' + state);
    $upload.addClass('state-' + val);
    state = val;

    switch (state) {
        case 'pedding':
            $placeHolder.removeClass('element-invisible');
            $queue.parent().removeClass('filled');
            $queue.hide();
            $statusBar.addClass('element-invisible');
            uploader.refresh();
            break;

        case 'ready':
            $placeHolder.addClass('element-invisible');
            $('#filePicker2').removeClass('element-invisible');
            $queue.parent().addClass('filled');
            $queue.show();
            $statusBar.removeClass('element-invisible');
            uploader.refresh();
            break;

        case 'uploading':
            $('#filePicker2').addClass('element-invisible');
            $progress.show();
            $upload.text('暂停上传');
            break;

        case 'paused':
            $progress.show();
            $upload.text('继续上传');
            break;

        case 'confirm':
            $progress.hide();
            $upload.text('开始上传').addClass('disabled');

            stats = uploader.getStats();
            if (stats.successNum && !stats.uploadFailNum) {
                setState('finish');
                return;
            }
            break;
        case 'finish':
            stats = uploader.getStats();
            if (stats.successNum) {
                // 成功后 给出删除方法
                toastr.success('完成上传操作，正在设置，请稍后···', '正在跳转···');
                setTimeout(function () {
                    window.location.reload();
                }, 1500);
            } else {
                // 没有成功的图片，重设
                state = 'done';
                location.reload();
            }
            break;
    }

    updateStatus();
}

uploader.onUploadProgress = function (file, percentage) {
    var $li = $('#' + file.id),
        $percent = $li.find('.progress span');

    $percent.css('width', percentage * 100 + '%');
    percentages[file.id][1] = percentage;
    updateTotalProgress();
};

uploader.onFileQueued = function (file) {
    fileCount++;
    fileSize += file.size;

    if (fileCount === 1) {
        $placeHolder.addClass('element-invisible');
        $statusBar.show();
    }

    addFile(file);
    setState('ready');
    updateTotalProgress();
};

uploader.onFileDequeued = function (file) {
    fileCount--;
    fileSize -= file.size;

    if (!fileCount) {
        setState('pedding');
    }

    removeFile(file);
    updateTotalProgress();

};

uploader.on('all', function (type) {
    var stats;
    switch (type) {
        case 'uploadFinished':
            setState('confirm');
            break;

        case 'startUpload':
            setState('uploading');
            break;

        case 'stopUpload':
            setState('paused');
            break;

    }
});

uploader.onError = function (code) {
    if (code == "Q_TYPE_DENIED") {
        toastr.warning('请上传.jpg.jpeg.png.gif格式的图片', '文件格式有误')
    } else if (code == "F_EXCEED_SIZE") {
        toastr.warning('图片总大小超过50M！', '文件大小超出');
    }
};

$upload.on('click', function () {
    if ($(this).hasClass('disabled')) {
        return false;
    }

    if (state === 'ready') {
        uploader.upload();
    } else if (state === 'paused') {
        uploader.upload();
    } else if (state === 'uploading') {
        uploader.stop();
    }
});

$info.on('click', '.retry', function () {
    uploader.retry();
});

$upload.addClass('state-' + state);
updateTotalProgress();


// 添加图片方法
uploader.on('uploadSuccess', function (file, response) {
    // console.log('上传成功：地址 => https://res.suyongw.com/' + response.key); //这里可以得到后台返回的数据
    // 在此处插入保存数据库操作
    $.ajax({
        url: HOST + '/cloud.images/add_lunbo_images',
        type: 'post',
        data: {
            key: 'http://res.suyongw.com/' + response.key
        },
        dataType: 'json',
        success: function (e) {
            // if (e.info == 1) {
            //     toastr.success('上传成功<img:' + response.key + '>');
            // } else
            if (e.info == 0) {
                toastr.warning('上传失败');
            }
            if (e.info == 2) {
                toastr.warning('最多只能上传5张图片');
            }
        }, error: function (e) {

            toastr.error('系统错误，请联系程序猿修复 >_<', '500 系统错误');
        }
    });
});

// 删除图片方法
$('.filelist').on('click', '.fa-stack', function (e) {
    if (confirm('请确定是否删除图片？')) {
        var del_key = $(this).attr('data-key');
        // 此处Ajax删除图片事件
        $.ajax({
            url: HOST + '/cloud.images/del_lunbo_images',
            type: 'post',
            data: {
                key: del_key
            },
            dataType: 'json',
            success: function (e) {
                if (e.info == 1) {
                    toastr.success('删除成功 - 正在刷新...');
                    setTimeout(function () {
                        window.location.reload();
                    }, 1000);
                } else if (e.info == 0) {
                    toastr.warning('删除失败');
                }
            }, error: function (e) {
                toastr.error('系统错误，请联系程序猿修复 >_<', '500 系统错误');
            }
        });
    }
});

